diff --git a/ActiveSync/iCalToDo+ActiveSync.m b/ActiveSync/iCalToDo+ActiveSync.m
index 3343c6667..503e6c760 100644
--- a/ActiveSync/iCalToDo+ActiveSync.m
+++ b/ActiveSync/iCalToDo+ActiveSync.m
@@ -57,7 +57,8 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
[s appendFormat: @"%d", (completed ? 1 : 0)];
// DateCompleted
- [s appendFormat: @"%@", [completed activeSyncRepresentation]];
+ if (completed)
+ [s appendFormat: @"%@", [completed activeSyncRepresentation]];
// Due date
NSCalendarDate *due;